Data analytics using neural networks is a modern trend in scientific research. One of these scientific tasks is the use of artificial intelligence in the time series research and forecasting. The paper considers the results of experiments on the use of one-dimensional convolutional layers in a neural network within the framework of the meteorological (wind speed) time series data classifying task. The improving of the forecast accuracy by adding convolutional layers is shown, which in the considered real problem reaches 9 %. Several variants of architectures for building a model with convolutional layers with an estimate of the accuracy of their prediction are given.
Aim. To analyse seasonal changes in the frequency characteristics of wind speed and direction in coastal Dagestan, namely the urban districts of the cities of Makhachkala and Derbent, from the point of view of wind power potential.Material and Methods. The research was based on time series of wind speed and direction for the period 2011-2018, obtained as a result of observations at the Makhachkala and Derbent weather stations. As a mathematical research tool, a continuous wavelet transform with a complex Morlet wavelet function was used.Results. According to the results of analysis, it was found that the main frequency of fluctuations in the time series is one day and one-day periodicity in the time series has pronounced seasonal changes. Also, differences in seasonal changes of one-day periodicity for wind speed and direction between the regions of Makhachkala and Derbent were established and described.Conclusion. The parameters considered in assessing seasonal changes in the dynamics of wind speed and direction can be used as additional parameters for the classification and clustering of regions to identify the best areas of wind power potential.
Objectives This work was devoted to the research of thermal processes that occur in the reflex areas of the human body, in particular, in reflexogenic areas of the human foot, under the thermal influence under ambulatory conditions.Method A model of thermal impact on the reflex areas of the human body was developed on the basis of a semiconductor thermoelectric device. A simplified physical model was studied, which does not consider heat exchange in thermoelectric batteries (TEBs) and elements of TEBs pairing with separate reflex zones.Results Diagrams for temperature distribution throughout the foot at different values of heat flow and diagrams of temperature changes over time were obtained. The thermal influence of a TEB brought in thermal contact with the opposite surface of the foot is negligible in this case; this is due to the low thermal conductivity of foot tissues, as well as insignificant thermal flows on its surface (low-power TEBs were used for such procedures).Conclusion The developed model of a semiconductor thermoelectric device for treating the reflex areas of the human body – in particular, the foot – allows an investigation of thermal processes occurring during the thermal treatment of biologically active points of the human sole. It is established that local temperature impact on a biological object does not result in significant temperature difference over its thickness.
Резюме. Цель. Целью статьи является разработка конструкции, физическое и математическое моделирование установки для получения пресной воды из атмосферного воздуха в прибрежных районах. Метод. Разработана конструкция, физическая и математическая модель установки для получения пресной воды из атмосферного воздуха путем конденсации ее на холодной поверхности, точка росы на которой будет создаваться за счет использования естественного холода морской воды с применением для ее циркуляции энергии движущихся волн, а также нагреве при поверхностного к ней воздушного слоя солнечными концентраторами с целью интенсификации процесса конденсации влаги. Результат. Получены данные о количестве получаемой пресной воды (ее массы) с единицы площади поверхности конденсации (1 м 2 ) за 1 час в зависимости от разности температур между поверхностью конденсации и морской воды, влиянии характеристик солнечного концентратора и жидкостного теплоотвода с морской водой на параметры установки. Вывод. Установлено, что значение полученной пресной воды из атмосферного воздуха сильно зависит от разности температур над поверхностью конденсации и морской воды. Так, согласно расчетам при увеличении последней на 45 К, масса пресной воды получаемой с 1 м 2 поверхности конденсации за 1 час увеличивается примерно вдвое и составляет примерно 5,8 кг.Ключевые слова: пресная вода, атмосферный воздух, морская вода, прибрежные районы, солнечные концентраторы, физическая и математическая модель, численный эксперимент Вестник Дагестанского государственного технического университета.Abstract. Objectives.The aim of the article is to develop the design and carry out the physical and mathematical modelling of a device for producing fresh water from atmospheric air in coastal areas, as well as under the conditions of sea transport. A Method for constructing the device for producing fresh water from atmospheric air is developed on the basis of a physical and mathematical model. Fresh water is obtained by condensation on a cold surface, which dew point is created using the natural cold of seawater with the application of the energy of moving waves for its circulation. The heating of the surface air layer adjacent to the cold surface by solar concentrators intensifies the process of the moisture condensation. Results. Data is obtained on the quantity (mass) of fresh water produced per unit of condensation surface area (1 m 2 ) for 1 hour depending on the temperature difference between the condensation surface and seawater. The influence of the characteristics of solar concentrator and liquid heat remover with seawater on the device parameters is studied. Conclusion. It is established that the amount of the fresh water obtained from atmospheric air strongly depends on the temperature difference between the condensation surface and seawater. Thus, according to calculations, with an increase of the latter by 45 K, the mass of fresh water obtained from a condensation surface of 1 m 2 in 1 hour approximately doubles to 5.8 kg.Введение. В настоящее время нехватка воды станов...
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